The people at risk of developing TB are those with weakened immune systems, so those who are HIV-positive, diabetics, malnourished people, children under the age of five, and the elderly. If children under the age of five receive this BCG vaccination early in life, they tend not to develop the serious forms of TB such as tubercular meningitis. Instead they'll get the pulmonary TB, which causes less morbidity and mortality.
On March 24th, 2014. See this statement in context.